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<a href="mempool_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// The MIT License (MIT)</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// Copyright (c) 2014 Mohammad Dashti</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">// (mohammad.dashti [at] epfl.ch - mdashti [at] GMail)</span></div><div class="line"><a name="l00004"></a><span class="lineno"><a class="line" href="mempool_8h.html#a86261d934fc0037fd4222a4bbe607fdc">    4</a></span>&#160;<span class="preprocessor">#define DEFAULT_CHUNK_SIZE 1024</span></div><div class="line"><a name="l00005"></a><span class="lineno"><a class="line" href="mempool_8h.html#a897472b9024f01f2c26aa6d6805e259f">    5</a></span>&#160;<span class="preprocessor">#define DEFAULT_FORCE_CLEAR true</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00007"></a><span class="lineno"><a class="line" href="classPool.html">    7</a></span>&#160;<span class="keyword">class </span><a class="code" href="classPool.html">Pool</a></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;{</div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;    <span class="keyword">typedef</span> <span class="keyword">union </span>__El</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;    {</div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;        __El() {};</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;        T obj;</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;        <span class="keyword">union </span>__El *next;</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;        ~__El() {};</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;    } El;</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;    El *free_;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;    El *data_;</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;    <span class="keywordtype">size_t</span> size_;</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;    <span class="keywordtype">bool</span> forceClear;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;    <span class="keywordtype">void</span> add_chunk()   <span class="comment">// precondition: no available elements</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        {</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;            size_ = size_ &lt;&lt; 1;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;            El *chunk = <span class="keyword">new</span> El[size_ + 1];</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; size_ - 1; ++i)</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;                chunk[i].next = &amp;chunk[i + 1];</div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;            chunk[size_ - 1].next = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;            chunk[size_].next = data_;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;            data_ = chunk;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;            free_ = chunk;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;        }</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="classPool.html#a888aa5ad1715a1e4b7c77b3feb1eabbe">   33</a></span>&#160;    <a class="code" href="classPool.html#a888aa5ad1715a1e4b7c77b3feb1eabbe">Pool</a>(<span class="keywordtype">size_t</span> chunk_size = <a class="code" href="mempool_8h.html#a86261d934fc0037fd4222a4bbe607fdc">DEFAULT_CHUNK_SIZE</a>) : data_(nullptr), size_(chunk_size &gt;&gt; 1), forceClear(false)</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        {</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;            add_chunk();</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        }</div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classPool.html#ab528bd55fc8b6dde0c9001d710ac7b9f">   37</a></span>&#160;    <a class="code" href="classPool.html#ab528bd55fc8b6dde0c9001d710ac7b9f">~Pool</a>()</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        {</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;            <span class="keywordtype">size_t</span> sz = size_;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;            <span class="keywordflow">while</span> (data_ != <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            {</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;                El *el = data_[sz].next;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;                <span class="keyword">delete</span>[] data_;</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;                data_ = el;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;                sz = sz &gt;&gt; 1;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;            }</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;        }</div><div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="classPool.html#a2f4c2e7c9bff98ca50378c65bc173df1">   48</a></span>&#160;    <span class="keyword">inline</span> T *<a class="code" href="classPool.html#a2f4c2e7c9bff98ca50378c65bc173df1">add</a>()</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        {</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;            <span class="keywordflow">if</span> (!free_)</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;            {</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;                forceClear = <span class="keyword">true</span>;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;                add_chunk();</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;            }</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;            El *el = free_;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;            free_ = free_-&gt;next;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;            <span class="keywordflow">return</span> &amp;(el-&gt;obj);</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        }</div><div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="classPool.html#a45c1e227ab658b1e9a40eafb6d211aff">   59</a></span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classPool.html#a45c1e227ab658b1e9a40eafb6d211aff">del</a>(T *obj)</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        {</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;            ((El *)obj)-&gt;next = free_;</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;            free_ = (El *)obj;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        }</div><div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="classPool.html#a96b382bc6687855efde20601ed80f5e4">   64</a></span>&#160;    <span class="keywordtype">void</span> <a class="code" href="classPool.html#a96b382bc6687855efde20601ed80f5e4">clear</a>(<span class="keywordtype">bool</span> force = <a class="code" href="mempool_8h.html#a897472b9024f01f2c26aa6d6805e259f">DEFAULT_FORCE_CLEAR</a>)</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        {</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;            <span class="keywordflow">if</span> (force || forceClear)</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;            {</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;                El *prevChunk = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;                El *chunk = data_;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;                <span class="keywordtype">size_t</span> sz = size_;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;                <span class="keywordtype">size_t</span> doubleSz = sz &lt;&lt; 1;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;                <span class="keywordflow">while</span> (chunk)</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;                {</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;                    <span class="keywordflow">if</span> (prevChunk)</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                    {</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                        prevChunk[doubleSz - 1].next = chunk;</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                    }</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; sz - 1; ++i)</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;                        chunk[i].next = &amp;chunk[i + 1];</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;                    chunk[sz - 1].next = <span class="keyword">nullptr</span>; <span class="comment">// did not change</span></div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;                    prevChunk = chunk;</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;                    chunk = chunk[sz].next;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;                    doubleSz = sz;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;                    sz = sz &gt;&gt; 1;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;                }</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;                free_ = data_;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;                forceClear = <span class="keyword">false</span>;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;            }</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        }</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;};</div><div class="ttc" id="mempool_8h_html_a86261d934fc0037fd4222a4bbe607fdc"><div class="ttname"><a href="mempool_8h.html#a86261d934fc0037fd4222a4bbe607fdc">DEFAULT_CHUNK_SIZE</a></div><div class="ttdeci">#define DEFAULT_CHUNK_SIZE</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00004">mempool.h:4</a></div></div>
<div class="ttc" id="classPool_html_a96b382bc6687855efde20601ed80f5e4"><div class="ttname"><a href="classPool.html#a96b382bc6687855efde20601ed80f5e4">Pool::clear</a></div><div class="ttdeci">void clear(bool force=DEFAULT_FORCE_CLEAR)</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00064">mempool.h:64</a></div></div>
<div class="ttc" id="classPool_html_a45c1e227ab658b1e9a40eafb6d211aff"><div class="ttname"><a href="classPool.html#a45c1e227ab658b1e9a40eafb6d211aff">Pool::del</a></div><div class="ttdeci">void del(T *obj)</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00059">mempool.h:59</a></div></div>
<div class="ttc" id="classPool_html_ab528bd55fc8b6dde0c9001d710ac7b9f"><div class="ttname"><a href="classPool.html#ab528bd55fc8b6dde0c9001d710ac7b9f">Pool::~Pool</a></div><div class="ttdeci">~Pool()</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00037">mempool.h:37</a></div></div>
<div class="ttc" id="classPool_html"><div class="ttname"><a href="classPool.html">Pool</a></div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00007">mempool.h:7</a></div></div>
<div class="ttc" id="classPool_html_a2f4c2e7c9bff98ca50378c65bc173df1"><div class="ttname"><a href="classPool.html#a2f4c2e7c9bff98ca50378c65bc173df1">Pool::add</a></div><div class="ttdeci">T * add()</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00048">mempool.h:48</a></div></div>
<div class="ttc" id="classPool_html_a888aa5ad1715a1e4b7c77b3feb1eabbe"><div class="ttname"><a href="classPool.html#a888aa5ad1715a1e4b7c77b3feb1eabbe">Pool::Pool</a></div><div class="ttdeci">Pool(size_t chunk_size=DEFAULT_CHUNK_SIZE)</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00033">mempool.h:33</a></div></div>
<div class="ttc" id="mempool_8h_html_a897472b9024f01f2c26aa6d6805e259f"><div class="ttname"><a href="mempool_8h.html#a897472b9024f01f2c26aa6d6805e259f">DEFAULT_FORCE_CLEAR</a></div><div class="ttdeci">#define DEFAULT_FORCE_CLEAR</div><div class="ttdef"><b>Definition:</b> <a href="mempool_8h_source.html#l00005">mempool.h:5</a></div></div>
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